Explanation:
Fossils can not form when bacteria can locate them. It has to be airtight, like an airtight container, only this container is in the shape of a fossil. If bacteria do get to a fossil it will have a hollow casing but this rarely happens, as fossils are rare because of this. It is even extremely rare when you happen upon a prehistoric bug in amber, rarely the sap from a tree will harden and become clear and turn into amber, this is very rare though.
Answer:
The answers are 1. If mud, silt or tar is in the area to preserve the fossil
2. If erosion dose not occur and allows the fossil to form
3. Oxygen and microorganisms cannot decay the bone
Explanation:
Fossils can't be formed when the area is dry and doesn't contain mud because mud preserves and limits the oxygen for the fossil to form. Erosion takes parts of the dead organisms away little by little; therefore fossils can only occur when erosion doesn't happen.
